S-SERIES INSTRUMENTS
5.
Light bulbs are plug-in type and are serviceable
from either front or rear of instrument cluster
(Figures 10 and 11).
Figure 10 Removing Bulb From Front of liter
Figure 11 Removing Bulb and Bulb Socket
From Rear of Cluster
FLEX-PRINTED CIRCUIT
One component of instrument cluster which is integral
with cluster body itself is the flex-printed circuit. This
tough flexible plastic film is cemented to cluster body to
simplify instrument wiring (25 electrical connections are
replaced by one). However, if the need should arise for
electrical troubleshooting, individual circuits on the
printed circuit are easily checked. This is accomplished
with cluster removed (Figure 12).
Circuit Testing
Obtain low voltage (battery powered) test light or circuit
tester. Position test probes on a selected circuit in a
manner similar to that shown in Figure 12. If test light
illuminates, circuit is unbroken, or if test light fails to
illuminate circuit is broken. Check each circuit in turn
and if a broken circuit is found, instrument cluster body
must be replaced.
Figure 12 Checked Printed Circuit Continuity
Replacement
Since printed circuit is cemented to and integral with
instrument cluster body, the printed circuit and cluster
body are available for replacement as a complete
assembly only. Where replacement is required, obtain
new instrument cluster body assembly and transfer all
gauges and light bulbs from old cluster body to new.
Individual parts of the instrument cluster, available for
service, are shown in
Figure 13 - Component of Instrument Cluster
CTS - 4140Y Page 5
